The baptism of the infant children of believers, paiduo in Greek, is an ancient custom of much of Christianity, including Catholics, the Orthodox churches, the Anglican churches, Lutherans, Presbyterians, and Methodists, to name a few. Churches with the name "Baptist" in their titles usually practice Believers baptism. This does not mean that they only baptize adults. Different groups recognize differing 'ages of reason' at which they will baptize an individual, often starting in early childhood.
Opponents of pedobaptism claim that is unbiblical. Pedobaptists however point to a number of passages where reference is made to baptising a person and their household – the households of Lydia, Crispus, and Stephanas are mentioned by name Acts 16:14-15, 18:8; 1 Cor 1:16. Pedobaptists argue that ones household would include ones children, even infants.